The Internet offers various tools to research phone numbers. Jim Richards, expert Internet user for AML duties and director of Fleet Boston's Financial Intelligence Unit, suggests some useful sites: AnyWho (www.anywho.com): Find a person or business by phone number using the reverse lookup feature. International Reverse Phone Searches: Find a person or business by phone number in Switzerland (www.pagesblanches.ch), or in France, Italy, Luxembourg, Denmark, Belgium or Canada (www.infobel.com) Payphone Directory (www.payphone-directory.com): Listing of payphone numbers by location in the U.S. and Canada. Cell Phones (www.cell-phone-numbers.com) : Trace a cell phone's user and billing address (fee-based).